diff --git a/composer.json b/composer.json
index be6d6030..66e40150 100644
--- a/composer.json
+++ b/composer.json
@@ -19,11 +19,13 @@
         "lessify"
     ],
     "autoload": {
-        "classmap": ["lessc.inc.php"]
+        "classmap": [
+            "lessc.inc.php"
+        ]
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7.27",
-        "squizlabs/php_codesniffer": "3.3.2"
+        "phpunit/phpunit": "^9.5.10",
+        "squizlabs/php_codesniffer": "^3.6"
     },
     "scripts": {
         "test": [